WpgLwr and simonskelly, the item looks to be printed by typography. I know Britain used embossing to produce postal stationery (envelopes). Was typography used to print envelopes? Could this be a cut square from a postal card? Being a halfpenny denomination, that is a possibility.
One thing for sure--it is not an ordinary stamp. I don't think it is in "Stanley Gibbons Specialised", the four kings.
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